Unit 4 Review

Lee charges $3 for a basket and $2.50 for each pound of fruit picked at the orchard. Write an equation in y = mx + b form for the total cost of x pounds of fruit from the orchard.

• y = 3x + 2.5
• y = 2.50x + 3
• y = 2.50x 
• y = 3x + 2.50

_{What is the y-intercept of the line?}

• y = 1/2
• y = 1
• y = -1/2
• y = -1

What is the y-intercept?

• 7
• 0
• 1
• 2

A candlestick burns at a rate of .2 inches per hour.  After 8 hours the candlestick is 13.4 inches tall.  _{what information is provided?}

• A point and a slope
• 2 points
• slope and y-intercept
• 2 objects-standard form

A candlestick burns at a rate of .2 inches per hour.  After 8 hours the candlestick is 13.4 inches tall. 
_{Find the original height of the candle.}

• 15 inches
• 15.6 inches
• 14.8 inches
• 16 inches

A candlestick burns at a rate of .2 inches per hour.  After 8 hours the candlestick is 13.4 inches tall. 
_{What is the slope?}

• 0.2
• - 0.2
• 13.4
• -13.4

You need to save $120 for a trip. You already have $36. You earn $14 per hour at your job. How many hours do you have to work to have $120?

Determine the slope. 

• -5
• 5
• -1/5
• 1/5

Write the equation for the line in slope-intercept form.

• y= -1x+3
• y= 4x+3
• y=1/4x+3
• y= -4x+3

Identify the slope of the following graph.

• Positive

• Negative

• Zero

• Undefined